ASN Wikibase Occurrence # 293827
This information is added by users of ASN. Neither ASN nor the Flight Safety Foundation are responsible for the completeness or correctness of this information.
If you feel this information is incomplete or incorrect, you can submit corrected information.
| Date: | Saturday 7 May 2005 |
| Time: | 16:37 LT |
| Type: |  Cessna 172RG |
| Owner/operator: | Grey Eagle Aviation, Inc. |
| Registration: | N4970V |
| MSN: | 172RG60435 |
| Total airframe hrs: | 5716 hours |
| Engine model: | Lycoming O-360-F1A6 |
| Fatalities: | Fatalities: 0 / Occupants: 3 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Grand Canyon, Arizona -
 United States of America
|
| Phase: | Unknown |
| Nature: | Private |
| Departure airport: | Grand Canyon-National Park Airport, AZ (GCN/KGCN) |
| Palomar Airport, CA | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
During an attempted takeoff, the airplane settled back to the ground and impacted a field about 1 mile south of the airport. The pilot reported that prior to the flight he performed performance calculations for the airplane to ensure that it was capable of departing the higher altitude airport. Performance calculations indicated that with the gross weight near the specified maximum, the airplane would need about 4,500 feet to take off. Prior to departure, the pilot configured the airplane with the flaps retracted and the mixture control in the full forward (rich) position. The Safety Board calculated gross weight of the airplane was 2,767 pounds (117 pounds over the airplane's maximum certified gross weight of 2,650 pounds). The pilot reported that his instructor told him to use an airplane empty weight of 1,624 pounds in his calculations, which the instructor said was typical for the airplane type and could be used for this specific airplane. Using this weight, the airplane would still have been 47 pounds in excess of the maximum gross weight. Performance calculations using the Pilot Operating Handbook (POH) for the airplane indicated a ground roll of 3,118 feet (zero wind 3,464 feet) and the distance to clear a 50- foot obstacle was 3,741 feet (zero wind 4,157 feet) with a predicted 327 feet per minute rate of climb. The POH notes that prior to takeoff from fields above 3,000 feet elevation, the mixture should be leaned to give maximum power in a full throttle, static run-up. The runway the pilot attempted to depart from was 8,999 feet in length with an elevation of 6,609 feet mean sea level (msl). The density altitude was calculated to be 7,728 feet msl. Following the accident, the spark plugs were removed and were black and sooty, an indication that the engine was running rich. The engine was then test-run with no operational anomalies noted.
Probable Cause: the pilot-in-command's failure to properly lean the mixture, which resulted in a power deficiency, a degraded climb capability, and the inability to attain/maintain an adequate airspeed that led to a stall/mush condition while departing during high density altitude conditions. Also causal, was the pilot-in-command's inaccurate preflight performance and weight and balance calculations.
Accident investigation:
 |
|
Sources:
NTSB LAX05LA160
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 10-Oct-2022 14:02 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
The Aviation Safety Network is an exclusive service provided by:
Quick Links:
| ASN Home | Send Correction / Feedback |
| FSF Home | Disclaimer | Copyright |
| Contact Us | Privacy Policy |
| Press / Media |
CONNECT WITH US:
©2024 Flight Safety Foundation